Nature of Operations and Basis of Presentation (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Goodwill

(Thousands of dollars)	Natural Gas Operations		Construction Services			Consolidated
December 31, 2017	$	10,095	$	169,219		$	179,314
Additional goodwill from Neuco acquisition		—		182			182
Foreign currency translation adjustment		—		(5,263	)		(5,263	)
June 30, 2018	$	10,095	$	164,138		$	174,233

Accounts Receivable for Services

Centuri’s accounts receivable for these services are presented in the table below (thousands of dollars):

	June 30, 2018		December 31, 2017
Centuri accounts receivable for services provided to Southwest	$	13,899	$	12,987

Schedule of Other Property and Investments

Other Property and Investments. Other property and investments on the Condensed Consolidated Balance Sheets includes (thousands of dollars):

	June 30, 2018			December 31, 2017
Southwest Gas Corporation:
Net cash surrender value of COLI policies	$	118,733		$	117,341
Other property		1,743			1,773
Total Southwest Gas Corporation		120,476			119,114
Centuri property, equipment, and intangibles		606,750			554,730
Centuri accumulated depreciation/amortization		(278,209	)		(258,906	)
Other property		13,219			13,242
Total Southwest Gas Holdings, Inc.	$	462,236		$	428,180

Other Income (Deductions)

The following table provides the composition of significant items included in Other income (deductions) in the Condensed Consolidated Statements of Income (thousands of dollars):

	Three Months Ended						Six Months Ended						Twelve Months Ended
	June 30,						June 30,						June 30,
	2018			2017			2018			2017			2018			2017
Southwest Gas Corporation - natural gas operations segment:
Change in COLI policies	$	2,000		$	1,900		$	1,300		$	4,700		$	6,900		$	9,000
Interest income		1,377			614			2,795			1,178			4,401			2,269
Equity AFUDC		357			633			586			1,109			1,773			2,116
Other components of net periodic benefit cost		(5,264	)		(4,857	)		(10,529	)		(9,712	)		(20,241	)		(19,591	)
Miscellaneous income and (expense)		(564	)		(1,095	)		(849	)		(1,324	)		(1,869	)		(3,637	)
Southwest Gas Corporation - total other income (deductions)		(2,094	)		(2,805	)		(6,697	)		(4,049	)		(9,036	)		(9,843	)
Construction services segment:
Interest income		1			1			2			1			4			1
Foreign transaction gain (loss)		202			(197	)		349			(198	)		(207	)		(201	)
Miscellaneous income and (expense)		(835	)		190			(720	)		445			(69	)		1,641
Centuri - total other income (deductions)		(632	)		(6	)		(369	)		248			(272	)		1,441
Corporate and administrative		20			1			26			1			38			1
Consolidated Southwest Gas Holdings, Inc. - total other income (deductions)	$	(2,706	)	$	(2,810	)	$	(7,040	)	$	(3,800	)	$	(9,270	)	$	(8,401	)